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The AzApi package contains the interfaces that must be 
implemented by a provider.
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The following diagram shows the backbone architecture of AzApi. 
Additional interfaces to those in the boxes are generally components 
included within the main boxes.
 
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                  +---------------+
                  |   AzService   | - create it
                  |               |
                  |               |
                  +---------------+
                                   
                  +---------------+                         +---------------+
                  |   AzRequest   | - create it             |   AzResponse  |
                  |    Context    | - addAzEntity (T)       |    Context    |
                  |               | - getAzEntity (T,id)    |               |
                  |               | - removeAzEntity (T,id) |               |
                  +---------------+                         +---------------+
                                   
                  +---------------+
                  |   AzEntity    | - create it
                  |      (T)      | - addAzAttribute (W) to it
                  | AzCategoryId* | - getAzAttribute from it (by attr id, next())
                  |               | - removeAzAttribute from it (by attr id, current())
                  |               | - getAzCategoryId (T)
                  +---------------+
                                   
                  +---------------+
                  |  AzAttribute  | - create it
                  |      (T)      | - setAzAttributeValue (U,V) to it
                  | AzCategoryId* | - getAzAttributeValue (U,V) from it
                  |               | - getAzCategoryId (T)
                  +---------------+
                                   
                  +--------------------------+
                  |         AzAttribute      | - create it
                  |            Value         | - setJavaObject to it
                  |            (U,V)         | - getJavaObject from it (V)
                  |    Xacml     |   Java    | - getAzDataTypeId (U)
                  |     type     |   type    |
                  |AzDataTypeId* |   AzData* |
                  +--------------+-----------+
                                   
	Note: AzRequestContext is collection of AzEntity collections
		AzEntity is collection of AzAttributes

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